Full-Stack Engineer - Frontend Focus (SaaS)

Wati Dot I O; Hong Kong; On-site; HKD 480,000 - 720,000; Full time

Job summary

Wati is seeking a Full-Stack Software Engineer with a strong frontend focus to help build the next-generation AI Customer Service Agent. You’ll contribute to key user-facing features and integrate external APIs while optimizing performance.

The role emphasizes frontend work (about 80%) with backend contributions, offering collaboration with product and design teams in a fast-growing international SaaS environment.

Qualifications

• Bachelor’s degree in CS or related field.
• 3–5 years of relevant work experience.
• Strong full-stack development capability.
• Proficient in backend languages (Python/Go) and front-end (JavaScript/TypeScript, React).

Responsibilities

• Build the AI Agent core architecture and integrate with existing products.
• Engage in full-stack development and optimize modules like decision-making and scheduling.
• Integrate and call external APIs to connect data sources.
• Improve usability, stability, and performance based on feedback and metrics.
• Collaborate with product, design, and business teams to gather requirements and iterate quickly.

Skills

Full-stack development

Python/Go

JavaScript/TypeScript

React

AI concepts

Team collaboration

Education

Bachelor’s degree or above in Computer Science or related field

Tools

Cursor

GCP

AWS

Job description

Wati is the world's leading WhatsApp-first conversational growth platform, empowering businesses to build deeper customer relationships and accelerate revenue growth.

Trusted and loved by over 14,000 customers across 100+ countries, Wati has established itself as the premier choice for businesses leveraging WhatsApp and other messaging channels to connect with customers on their platform of choice.

In a world where real-time interactions drive growth, Wati's story is all about business growth through conversations. At Wati, we believe that every conversation matters, whether it's engaging a first-time prospect, nurturing a qualified lead, or deepening relationships with loyal clients. We transform these conversations into opportunities for building relationships, and strong relationships lead to increased revenue.

Our Platform

The AI-native platform simplifies complex business operations by bringing all customer interactions under one intelligent roof. Designed for scalability and ease of use, our solution delivers a measurable ROI while adapting to businesses of all sizes, from emerging startups to established enterprises.

Our Backing & Partnerships

Wati is proudly backed by world-class investors including Tiger Global, Sequoia Capital, DST Global, and Shopify. As a Premium-tier Partner of Meta, Google, and WhatsApp, we maintain the highest standards of integration and platform excellence.

About The Role

We’re looking for a Full-Stack Software Engineer with a strong frontend focus (about 80% frontend, 20% backend) to help build our next-generation AI Customer Service Agent. You’ll develop key user-facing features, integrate external APIs, and improve overall performance while working closely with the product and design teams.

Job Responsibilities

• Participate in building the next-generation SaaS Customer Service Agent, responsible for the core architecture design and development of the AI Agent, ensuring seamless integration with existing products.
• Engage in full-stack development and AI Agent construction, optimizing key modules such as decision-making, task scheduling, and multimodal data processing for performance and stability.
• Integrate and call various external APIs to connect internal and external data sources.
• Continuously optimize the Agent’s usability, stability, and effectiveness based on feedback and performance metrics, ensuring high performance and scalability.
• Collaborate closely with product, design, and business teams to gather requirements, design scalable solutions, and drive rapid iteration and deployment.

Requirements

• Bachelor’s degree or above in Computer Science or a related field, with 3–5 years of relevant work experience.

• Strong full-stack development capability, proficient in backend languages such as Python or Go, and good front-end experience including JavaScript / TypeScript and frameworks such as React, with clean and structured coding practices.
• Familiarity with AI concepts and frameworks related to Agent development.
• Strong problem-solving and independent working skills, with excellent communication and teamwork abilities.

Preferred Qualifications

• Proficiency in using AI-driven development tools (e.g. Cursor) to improve front-end development efficiency.
• Experience in developing Agent systems or automation frameworks; experience in secondary development on Dify or Coze is a plus.
• Familiarity with cloud platforms such as GCP or AWS.
• Fluency in English for daily work; management experience is an advantage.

What You’ll Gain

• Opportunity to use cutting-edge AI technology to build and scale real-time communication systems supporting global users.
• Close collaboration with senior engineers to rapidly grow your technical expertise.
• Valuable experience in a fast-growing, international SaaS company.